Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.48: Poster
Montag, 25. Februar 2008, 18:30–19:30, Poster F
Optically monitored wet chemical preparation of SEIRA active metallic nanostructures — •Dominik Enders1,2, Tadaaki Nagao1,2,3, Tomonobu Nakayama1,2, and Masakazu Aono1,2,3 — 1National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan — 2Nanoscale Quantum Conductor Array Project, ICORP, JST, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan — 3WPI Center for Materials Nanoarchitectonics (MANA), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
The use of wet chemical methods for the preparation of surface enhanced infrared absorption (SEIRA) active nanostructures has gained much interest in the last years because of its easiness, simplicity, and the low time consumption compared to the known ultra high vacuum based methods. We present a two-step wet-chemical preparation method of plasmonic SEIRA active nanostructures. While in the first step spherical Au nanoparticles are deposited on the SiO2/Si surface, these nanoparticles are grown in the second step to form elongated tabular islands close to the percolation threshold. In situ monitoring of the preparation process by IR spectroscopy ensures the control of film morphology during the preparation process and enables the reproducible fabrication of highly sensitive SEIRA films [1].
A comparison of our Au films with SEIRA inactive Au films shows, that in IR spectra of octadecanethiol, the CH stretching vibrational peaks are enhanced by several orders of magnitude.
[1] D. Enders, T. Nagao, T. Nakayama, and M. Aono, Jpn. J. Appl. Phys. (in press).